ANSWER: No, this applies only to traveling and going up and down mountains or hills. https://islamqa.info/en/answers/164340/remembering-allah-when-climbing-and-descending-stairs

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ANSWER: No, you must dispose of the interest money to poor and needy Muslims and keep the capital amount

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ANSWER: If the cash + silver reaches the value of 595 grams of silver, or the cash alone, you must give zakat on it. Similarly, if the cash + gold reach the value of 85 grams of pure gold, there is zakat on it. 

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